Cherryh continues to prove she is the most insightful of science fiction writers. The desert world, alien beasts, and culture are so perfectly documented you'd swear the author lived with the Bedouin for a few years! Hammerfall is about a human civilization struggling to survive on a barely inhabitable planet. Tribes are constantly at war with one another, and with the Taliban-like central government, run by a woman. When the planet is threatened by a galactic government intent on cleansing, it is up to a mad man to unite them all in a great migration to a safe place. As usual, Cherryh poses interesting sociological questions as well as personal issues about leadership and responsibility. The descriptions are detailed and the characters are realistic. The animals they ride are so cool, like the ultimate camels. The relationship between the main character and his two female companions is tender and interesting. Anyone who like a good deep read with a satisfying ending should check out "Hammerfall."